Headstock construction



Feb. 3. 1925.v

C. BOUILLON HEADSTOCK CONSTRUCTION Filed 0G11. l5. 1921 @f www@ PatentedFeb. 3, 1925.

entre STATES CONSTANT BOUILLON, 0F TOBGR'NGTGN, CO'NNECTC'UT, ASSGNOR T0HENDEY MA- CHINE COMPANY, DF TOBRNGTON, CONNEGTCUT, A COR-PGRATON OFCON- NECTICUT.

HEADSTOCK CONSTRUCTION.

Application filed October 15, 1921. Serial No. 507,839,

To @ZZ who/1t t may concern.'

Be it known that l, CONSTANT BOUILLON, a citizen of the United States,residing at Torrington, in the county of Litchfield and State ofConnecticut, have'invented a new and useful l-ieadstock Construction, ofwhich the following is a specification.

The object of this invention is to improve the construction ofheadstocks of machine tools, such as lathes and milling machines. Tothis end, the invention consists of a headstock carrying the usualbearings, a spindle fitted therein7` a face gear keyed or fitted to turnwith the spindle but so as to permit axial adjustment between thespindle and gear, a bearing sleeve keyed or fitted io turn with thespindle but so as to permit axial adjustment between the spindle andslee-vc, a driving pulley and connected pinion fitted to turn on saidsleeve and means for adjusting said spindle axially. This constructionis particularly adapted for use in back geared headstocks andparticularly where the machine tool with such headstock is used as aninstrument of precision.

'l` he invention is illustrated .in the accompanying drawing, in which-Fig. 1 is a cross sectional elevation through a headstock constructed toembody my improvement; and

Fig. 2 is a partial cross-sectional view illustrating a modified form offront bearing.

Referring to the drawing and in detail, A designates the headstockcasting or block, which is provided with the usual front and rearnprights. A bearing 1 is secured or keyed in the Yfront or right handhub and this bearing is kept in place by a collar 2 on its right handend and by a nut 3 threaded thereon, which nut has an extended recessedflange et. A bearing 5 is arranged in the rear or left hand hub. Thespindle is designated by 6. The spindle is usually made hollow and isbored or reamed out at its right hand end so as to receive the usualcenter. The spindie is made with a shoulder 7 which bears against acollar 8 arranged between said shoulder and the right hand end of thebearing 1.

QI`he spindle then has a section 9, which is ground or finished -so asto fit accurately in the bearing 1. The spindle is next'made with astraight section 10, on which is placed a face gear 11, the right handend of the hub of the face gear bearing on the left hand end of thebearing 1. rhe spindle is next made with a straight-section 12, fittedon which section is a hearing sleeve 13 having a collar 14 at itsleft-hand end.v

rlie spindle is next made with a threaded section 15 on which arethreaded one or more adjusting nuts 16. The spindle is next made with astraight section 17, which is fitted in the bearing 5. A feed gear 18 isnext keyed on the spindle and kept in place by a nut 19 threaded on theleft hand end of the spindle.

A key-way 2O is cut through the threaded section 15 and also alongthrough the sections 12 and 10 of the spindle 6 nearly to the shoulderbetween the section 10 and the section 9. A key 21 somewhat 'shorter inlength than the hub of the face gear is fitted in the face gear 11 andin said key-way 20, said key being provided with a tit to keep it inplace. The face gear 11 is thus keyed or fitted to turn with the spindlebut axial adjustment is permitted between the spindle and the face gear.A key 22, provided with a tit, is fitted in the bearing sleeve 13 and insaid key-way 2O so that said bearing sleeve will turn with the spindlebut axial adjustment is permitted between said spindle and said sleeve.

A pulley 23 such as a cone pulley having four steps has a back geardriving pinion 2&1 driven therein and held in place by a screw 25 sothat said pulley and pinion form one piece. This piece is placed on andis free to revolve on said sleeve 13 between the collar 14, and the leftend of the face gear 11. The sleeve 13 is provided with an oil channel26 extending its whole length and communicating with a spring coveredoiler pressed into the collar 14 on the sleeve.

A connecting screw or pin 27 is arranged between the face gear 11 andthe right hand face of the driving pulley 23 in the usual manner so-that the driving pulley can be connected to the face gear by theinsertion of said pin or so that said cone pulley can be left free torevolve by the withdrawal of said pin.

The construction described is adapted for use in a back gearedheadstock, that is, when the driving pulley is connected to the facegear, the back gears are thrown out and the drive of the pulley goesthrough to the face gear directly to the spindle and so that when' thepin is removed from between the face gear and the driving pulley, theback gears are thrown in so that the drive will be connected at areduced speed through the back gear yinion 24 and the back gears to thetace gear ll and thus to the spindle. It is not thought necessaryv toshow the back gears as the same are Well understood and commonlyemployed in lieadstoeks.

The parts are assembled as illustrated in the drawing. Vshcn it isdesired to adjust the spindle in its bearings the nuts 16 are turned tomake such adjustment. Ey turning the nuts to draw the spindle to theleft the section of the spinale may be drawn 'further into the bearingl. lt the hole in this beariiw is made tapered as illustrated in Fig.i,` 'a tighter tit is obtained by this adjustment. it this bearingl ismade straight as indieated in Fig. Q, the spindlewill be adjustedaxially to the rear or lett to take up Wear on the thrust collar 8. Thisadjustment docs not atleet the runningy freedom of the driving pull'evand connected pinion on the driving sleeve, nor does it atleet or bringany end pressure on the rear or left hand bearing.

rllhe details and arrangements herein shown andv described majv begreatly varied by a skilled mechanic without departing from the scope ofmy invention as expressed in the claim.

Having thus fully described my invention what l elaiin and desire tosecure by Letters Patent is:h p-

n aheadstoelf, the combination of a front bearing and a rear bearing,aspindle having` sections fitted in vsaid bearings, a. face gear keyeddirectlyY on the spindle but so as to permit axial adjustment betweenthe spindle and gear', the hub of said face gear bearing on the end ofsaid bearing, littedY to turn With the spindle but so as to permit axialadjustment between the spindle and sleeve one end of said sleeve bearingon the tace gear. said sleeve having afeollar,V

a driving' pulley and Connected pinion fitted to 'turn on said sleevebetween said collar a bearing,` sleeveI and tace gear:` and anadjustingnut or nuts f threaded on said spindle, vvherebj7 said spindlecan be adjusted in said front bea ing' Without affecting the runningfreedom ot said driving pulley and pinion on said sleeve.

ln testimony whereof I have hereunto athxed in v signature ooNsTANTBOUILLON.

